I feel very lucky that my boyfriend of 3 years is willing to move with me, wherever I end up next year. But we've been living together for the last 2 years, are in our late 20s, and are really committed to being together for the long haul. If he's unable to find a good job and is otherwise unhappy living where I'm going to school, then we'll join the long distance club...
I am in the same boat as Dr. Maybe, but I've also done long-distance. I've been dating my boyfriend for 7 years and I'm in my mid-twenties (I know, I know, it sounds nuts). I am a year older, so we spent our first year apart when I went to college in San Francisco, a semester apart when I went abroad a couple years later, then another year apart when he went about my last year of undergrad. We both moved back home live with our respective parents...waiting for me to get in to school and get on with life!
The boyfriend will move with me wherever we go- he's most likely interested in a master's level environmental science degree, which can wait a year or two until we move, and well, frankly, he doesn't have ovaries...I have to get out of grad school before I CAN'T have children anymore. So we've put the priority on my going to school and are banking on him being able to find a program in whatever city we land in.
It's been tough at times, and if someone had told me seven years ago I would do a long-distance relationship, I'd have said they were crazy! I agree that it is easier to do once you've spent some time apart and gotten used to doing things on your own. Sometimes we were able to manage seeing each other every-other month, but like when we were abroad, we didn't see each other at all. Right now the boyfriend is doing environmental-sciencey-fishy-water-field-work out of state, Monday-Friday, so we only see each other on the weekends. He had a job similar last summer, and although I was saddened at first and worried it would be too hard again, it's not!
Being apart during the week is totally doable for me! We both have SO much going on, we have short little cell phone conversations at night to make sure he didn't get lost in the woods or that I didn't get rejected from ANOTHER school. Other than that, he comes back on the weekend, and our lives resume seamlessly together like there's no change.
Long distance with someone in med school would be really tough though! Med school students get increasingly less flexibility in their schedules and have shorter and shorter breaks. I would just do my best to put a priority on finding times that you can visit each other and doing your best to stick to that schedule. Good luck to any of you attempting this!